Fix property tests by providing mintable native token

[Stefan-Ethernal]

Description

Through #2002, we have introduced the validation that rootchain-originated tokens must have accompanied custom reward token. However, that change was not reflected in the property-based tests.

So instead of using rootchain originated token as the Supernets native one, we are using Supernets mintable token instead and bypass the validation.

Changes include

• Bugfix (non-breaking change that solves an issue)
• Hotfix (change that solves an urgent issue, and requires immediate attention)
• New feature (non-breaking change that adds functionality)
• Breaking change (change that is not backwards-compatible and/or changes current functionality)

Breaking changes

Please complete this section if any breaking changes have been made, otherwise delete it

Checklist

• I have assigned this PR to myself
• I have added at least 1 reviewer
• I have added the relevant labels
• I have updated the official documentation
• I have added sufficient documentation in code

Testing

• I have tested this code with the official test suite
• I have tested this code manually

Manual tests

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Documentation update

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Additional comments

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[sonarcloud]

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